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qmp: fill in the image field in BlockDeviceInfo
[qemu/ar7.git] / blockdev.c
bloba136b2ed471bc96173b84a70ad4a631624d1f986
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "sysemu/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "monitor/monitor.h"
38 #include "qemu/option.h"
39 #include "qemu/config-file.h"
40 #include "qapi/qmp/types.h"
41 #include "qapi-visit.h"
42 #include "qapi/qmp-output-visitor.h"
43 #include "qapi/util.h"
44 #include "sysemu/sysemu.h"
45 #include "block/block_int.h"
46 #include "qmp-commands.h"
47 #include "trace.h"
48 #include "sysemu/arch_init.h"
49
50 static const char *const if_name[IF_COUNT] = {
51 [IF_NONE] = "none",
52 [IF_IDE] = "ide",
53 [IF_SCSI] = "scsi",
54 [IF_FLOPPY] = "floppy",
55 [IF_PFLASH] = "pflash",
56 [IF_MTD] = "mtd",
57 [IF_SD] = "sd",
58 [IF_VIRTIO] = "virtio",
59 [IF_XEN] = "xen",
60 };
61
62 static int if_max_devs[IF_COUNT] = {
63 /*
64 * Do not change these numbers! They govern how drive option
65 * index maps to unit and bus. That mapping is ABI.
66 *
67 * All controllers used to imlement if=T drives need to support
68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
69 * Otherwise, some index values map to "impossible" bus, unit
70 * values.
71 *
72 * For instance, if you change [IF_SCSI] to 255, -drive
73 * if=scsi,index=12 no longer means bus=1,unit=5, but
74 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
75 * the drive can't be set up. Regression.
76 */
77 [IF_IDE] = 2,
78 [IF_SCSI] = 7,
79 };
80
81 /**
82 * Boards may call this to offer board-by-board overrides
83 * of the default, global values.
84 */
85 void override_max_devs(BlockInterfaceType type, int max_devs)
86 {
87 BlockBackend *blk;
88 DriveInfo *dinfo;
89
90 if (max_devs <= 0) {
91 return;
92 }
93
94 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
95 dinfo = blk_legacy_dinfo(blk);
96 if (dinfo->type == type) {
97 fprintf(stderr, "Cannot override units-per-bus property of"
98 " the %s interface, because a drive of that type has"
99 " already been added.\n", if_name[type]);
100 g_assert_not_reached();
101 }
102 }
103
104 if_max_devs[type] = max_devs;
105 }
106
107 /*
108 * We automatically delete the drive when a device using it gets
109 * unplugged. Questionable feature, but we can't just drop it.
110 * Device models call blockdev_mark_auto_del() to schedule the
111 * automatic deletion, and generic qdev code calls blockdev_auto_del()
112 * when deletion is actually safe.
113 */
114 void blockdev_mark_auto_del(BlockBackend *blk)
115 {
116 DriveInfo *dinfo = blk_legacy_dinfo(blk);
117 BlockDriverState *bs = blk_bs(blk);
118 AioContext *aio_context;
119
120 if (!dinfo) {
121 return;
122 }
123
124 aio_context = bdrv_get_aio_context(bs);
125 aio_context_acquire(aio_context);
126
127 if (bs->job) {
128 block_job_cancel(bs->job);
129 }
130
131 aio_context_release(aio_context);
132
133 dinfo->auto_del = 1;
134 }
135
136 void blockdev_auto_del(BlockBackend *blk)
137 {
138 DriveInfo *dinfo = blk_legacy_dinfo(blk);
139
140 if (dinfo && dinfo->auto_del) {
141 blk_unref(blk);
142 }
143 }
144
145 /**
146 * Returns the current mapping of how many units per bus
147 * a particular interface can support.
148 *
149 * A positive integer indicates n units per bus.
150 * 0 implies the mapping has not been established.
151 * -1 indicates an invalid BlockInterfaceType was given.
152 */
153 int drive_get_max_devs(BlockInterfaceType type)
154 {
155 if (type >= IF_IDE && type < IF_COUNT) {
156 return if_max_devs[type];
157 }
158
159 return -1;
160 }
161
162 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
163 {
164 int max_devs = if_max_devs[type];
165 return max_devs ? index / max_devs : 0;
166 }
167
168 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
169 {
170 int max_devs = if_max_devs[type];
171 return max_devs ? index % max_devs : index;
172 }
173
174 QemuOpts *drive_def(const char *optstr)
175 {
176 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
177 }
178
179 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
180 const char *optstr)
181 {
182 QemuOpts *opts;
183
184 opts = drive_def(optstr);
185 if (!opts) {
186 return NULL;
187 }
188 if (type != IF_DEFAULT) {
189 qemu_opt_set(opts, "if", if_name[type], &error_abort);
190 }
191 if (index >= 0) {
192 qemu_opt_set_number(opts, "index", index, &error_abort);
193 }
194 if (file)
195 qemu_opt_set(opts, "file", file, &error_abort);
196 return opts;
197 }
198
199 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
200 {
201 BlockBackend *blk;
202 DriveInfo *dinfo;
203
204 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
205 dinfo = blk_legacy_dinfo(blk);
206 if (dinfo && dinfo->type == type
207 && dinfo->bus == bus && dinfo->unit == unit) {
208 return dinfo;
209 }
210 }
211
212 return NULL;
213 }
214
215 bool drive_check_orphaned(void)
216 {
217 BlockBackend *blk;
218 DriveInfo *dinfo;
219 bool rs = false;
220
221 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
222 dinfo = blk_legacy_dinfo(blk);
223 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
224 /* Unless this is a default drive, this may be an oversight. */
225 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
226 dinfo->type != IF_NONE) {
227 fprintf(stderr, "Warning: Orphaned drive without device: "
228 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
229 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
230 dinfo->bus, dinfo->unit);
231 rs = true;
232 }
233 }
234
235 return rs;
236 }
237
238 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
239 {
240 return drive_get(type,
241 drive_index_to_bus_id(type, index),
242 drive_index_to_unit_id(type, index));
243 }
244
245 int drive_get_max_bus(BlockInterfaceType type)
246 {
247 int max_bus;
248 BlockBackend *blk;
249 DriveInfo *dinfo;
250
251 max_bus = -1;
252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
253 dinfo = blk_legacy_dinfo(blk);
254 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
255 max_bus = dinfo->bus;
256 }
257 }
258 return max_bus;
259 }
260
261 /* Get a block device. This should only be used for single-drive devices
262 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
263 appropriate bus. */
264 DriveInfo *drive_get_next(BlockInterfaceType type)
265 {
266 static int next_block_unit[IF_COUNT];
267
268 return drive_get(type, 0, next_block_unit[type]++);
269 }
270
271 static void bdrv_format_print(void *opaque, const char *name)
272 {
273 error_printf(" %s", name);
274 }
275
276 typedef struct {
277 QEMUBH *bh;
278 BlockDriverState *bs;
279 } BDRVPutRefBH;
280
281 static void bdrv_put_ref_bh(void *opaque)
282 {
283 BDRVPutRefBH *s = opaque;
284
285 bdrv_unref(s->bs);
286 qemu_bh_delete(s->bh);
287 g_free(s);
288 }
289
290 /*
291 * Release a BDS reference in a BH
292 *
293 * It is not safe to use bdrv_unref() from a callback function when the callers
294 * still need the BlockDriverState. In such cases we schedule a BH to release
295 * the reference.
296 */
297 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
298 {
299 BDRVPutRefBH *s;
300
301 s = g_new(BDRVPutRefBH, 1);
302 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
303 s->bs = bs;
304 qemu_bh_schedule(s->bh);
305 }
306
307 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
308 {
309 if (!strcmp(buf, "ignore")) {
310 return BLOCKDEV_ON_ERROR_IGNORE;
311 } else if (!is_read && !strcmp(buf, "enospc")) {
312 return BLOCKDEV_ON_ERROR_ENOSPC;
313 } else if (!strcmp(buf, "stop")) {
314 return BLOCKDEV_ON_ERROR_STOP;
315 } else if (!strcmp(buf, "report")) {
316 return BLOCKDEV_ON_ERROR_REPORT;
317 } else {
318 error_setg(errp, "'%s' invalid %s error action",
319 buf, is_read ? "read" : "write");
320 return -1;
321 }
322 }
323
324 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
325 {
326 if (throttle_conflicting(cfg)) {
327 error_setg(errp, "bps/iops/max total values and read/write values"
328 " cannot be used at the same time");
329 return false;
330 }
331
332 if (!throttle_is_valid(cfg)) {
333 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
334 return false;
335 }
336
337 return true;
338 }
339
340 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
341
342 /* Takes the ownership of bs_opts */
343 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
344 Error **errp)
345 {
346 const char *buf;
347 int ro = 0;
348 int bdrv_flags = 0;
349 int on_read_error, on_write_error;
350 BlockBackend *blk;
351 BlockDriverState *bs;
352 ThrottleConfig cfg;
353 int snapshot = 0;
354 bool copy_on_read;
355 Error *error = NULL;
356 QemuOpts *opts;
357 const char *id;
358 bool has_driver_specific_opts;
359 BlockdevDetectZeroesOptions detect_zeroes;
360
361 /* Check common options by copying from bs_opts to opts, all other options
362 * stay in bs_opts for processing by bdrv_open(). */
363 id = qdict_get_try_str(bs_opts, "id");
364 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
365 if (error) {
366 error_propagate(errp, error);
367 goto err_no_opts;
368 }
369
370 qemu_opts_absorb_qdict(opts, bs_opts, &error);
371 if (error) {
372 error_propagate(errp, error);
373 goto early_err;
374 }
375
376 if (id) {
377 qdict_del(bs_opts, "id");
378 }
379
380 has_driver_specific_opts = !!qdict_size(bs_opts);
381
382 /* extract parameters */
383 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
384 ro = qemu_opt_get_bool(opts, "read-only", 0);
385 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
386
387 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
388 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
389 error_setg(errp, "invalid discard option");
390 goto early_err;
391 }
392 }
393
394 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
395 bdrv_flags |= BDRV_O_CACHE_WB;
396 }
397 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
398 bdrv_flags |= BDRV_O_NOCACHE;
399 }
400 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
401 bdrv_flags |= BDRV_O_NO_FLUSH;
402 }
403
404 #ifdef CONFIG_LINUX_AIO
405 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
406 if (!strcmp(buf, "native")) {
407 bdrv_flags |= BDRV_O_NATIVE_AIO;
408 } else if (!strcmp(buf, "threads")) {
409 /* this is the default */
410 } else {
411 error_setg(errp, "invalid aio option");
412 goto early_err;
413 }
414 }
415 #endif
416
417 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
418 if (is_help_option(buf)) {
419 error_printf("Supported formats:");
420 bdrv_iterate_format(bdrv_format_print, NULL);
421 error_printf("\n");
422 goto early_err;
423 }
424
425 if (qdict_haskey(bs_opts, "driver")) {
426 error_setg(errp, "Cannot specify both 'driver' and 'format'");
427 goto early_err;
428 }
429 qdict_put(bs_opts, "driver", qstring_from_str(buf));
430 }
431
432 /* disk I/O throttling */
433 memset(&cfg, 0, sizeof(cfg));
434 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
435 qemu_opt_get_number(opts, "throttling.bps-total", 0);
436 cfg.buckets[THROTTLE_BPS_READ].avg =
437 qemu_opt_get_number(opts, "throttling.bps-read", 0);
438 cfg.buckets[THROTTLE_BPS_WRITE].avg =
439 qemu_opt_get_number(opts, "throttling.bps-write", 0);
440 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
441 qemu_opt_get_number(opts, "throttling.iops-total", 0);
442 cfg.buckets[THROTTLE_OPS_READ].avg =
443 qemu_opt_get_number(opts, "throttling.iops-read", 0);
444 cfg.buckets[THROTTLE_OPS_WRITE].avg =
445 qemu_opt_get_number(opts, "throttling.iops-write", 0);
446
447 cfg.buckets[THROTTLE_BPS_TOTAL].max =
448 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
449 cfg.buckets[THROTTLE_BPS_READ].max =
450 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
451 cfg.buckets[THROTTLE_BPS_WRITE].max =
452 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
453 cfg.buckets[THROTTLE_OPS_TOTAL].max =
454 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
455 cfg.buckets[THROTTLE_OPS_READ].max =
456 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
457 cfg.buckets[THROTTLE_OPS_WRITE].max =
458 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
459
460 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
461
462 if (!check_throttle_config(&cfg, &error)) {
463 error_propagate(errp, error);
464 goto early_err;
465 }
466
467 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
468 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
469 on_write_error = parse_block_error_action(buf, 0, &error);
470 if (error) {
471 error_propagate(errp, error);
472 goto early_err;
473 }
474 }
475
476 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
477 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
478 on_read_error = parse_block_error_action(buf, 1, &error);
479 if (error) {
480 error_propagate(errp, error);
481 goto early_err;
482 }
483 }
484
485 detect_zeroes =
486 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
487 qemu_opt_get(opts, "detect-zeroes"),
488 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
489 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
490 &error);
491 if (error) {
492 error_propagate(errp, error);
493 goto early_err;
494 }
495
496 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
497 !(bdrv_flags & BDRV_O_UNMAP)) {
498 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
499 "without setting discard operation to unmap");
500 goto early_err;
501 }
502
503 /* init */
504 if ((!file || !*file) && !has_driver_specific_opts) {
505 blk = blk_new_with_bs(qemu_opts_id(opts), errp);
506 if (!blk) {
507 goto early_err;
508 }
509
510 bs = blk_bs(blk);
511 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
512 bs->read_only = ro;
513
514 QDECREF(bs_opts);
515 } else {
516 if (file && !*file) {
517 file = NULL;
518 }
519
520 if (snapshot) {
521 /* always use cache=unsafe with snapshot */
522 bdrv_flags &= ~BDRV_O_CACHE_MASK;
523 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
524 }
525
526 if (copy_on_read) {
527 bdrv_flags |= BDRV_O_COPY_ON_READ;
528 }
529
530 if (runstate_check(RUN_STATE_INMIGRATE)) {
531 bdrv_flags |= BDRV_O_INCOMING;
532 }
533
534 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
535
536 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
537 errp);
538 if (!blk) {
539 goto err_no_bs_opts;
540 }
541 bs = blk_bs(blk);
542 }
543
544 bs->detect_zeroes = detect_zeroes;
545
546 bdrv_set_on_error(bs, on_read_error, on_write_error);
547
548 /* disk I/O throttling */
549 if (throttle_enabled(&cfg)) {
550 bdrv_io_limits_enable(bs);
551 bdrv_set_io_limits(bs, &cfg);
552 }
553
554 if (bdrv_key_required(bs)) {
555 autostart = 0;
556 }
557
558 err_no_bs_opts:
559 qemu_opts_del(opts);
560 return blk;
561
562 early_err:
563 qemu_opts_del(opts);
564 err_no_opts:
565 QDECREF(bs_opts);
566 return NULL;
567 }
568
569 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
570 Error **errp)
571 {
572 const char *value;
573
574 value = qemu_opt_get(opts, from);
575 if (value) {
576 if (qemu_opt_find(opts, to)) {
577 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
578 "same time", to, from);
579 return;
580 }
581 }
582
583 /* rename all items in opts */
584 while ((value = qemu_opt_get(opts, from))) {
585 qemu_opt_set(opts, to, value, &error_abort);
586 qemu_opt_unset(opts, from);
587 }
588 }
589
590 QemuOptsList qemu_legacy_drive_opts = {
591 .name = "drive",
592 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
593 .desc = {
594 {
595 .name = "bus",
596 .type = QEMU_OPT_NUMBER,
597 .help = "bus number",
598 },{
599 .name = "unit",
600 .type = QEMU_OPT_NUMBER,
601 .help = "unit number (i.e. lun for scsi)",
602 },{
603 .name = "index",
604 .type = QEMU_OPT_NUMBER,
605 .help = "index number",
606 },{
607 .name = "media",
608 .type = QEMU_OPT_STRING,
609 .help = "media type (disk, cdrom)",
610 },{
611 .name = "if",
612 .type = QEMU_OPT_STRING,
613 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
614 },{
615 .name = "cyls",
616 .type = QEMU_OPT_NUMBER,
617 .help = "number of cylinders (ide disk geometry)",
618 },{
619 .name = "heads",
620 .type = QEMU_OPT_NUMBER,
621 .help = "number of heads (ide disk geometry)",
622 },{
623 .name = "secs",
624 .type = QEMU_OPT_NUMBER,
625 .help = "number of sectors (ide disk geometry)",
626 },{
627 .name = "trans",
628 .type = QEMU_OPT_STRING,
629 .help = "chs translation (auto, lba, none)",
630 },{
631 .name = "boot",
632 .type = QEMU_OPT_BOOL,
633 .help = "(deprecated, ignored)",
634 },{
635 .name = "addr",
636 .type = QEMU_OPT_STRING,
637 .help = "pci address (virtio only)",
638 },{
639 .name = "serial",
640 .type = QEMU_OPT_STRING,
641 .help = "disk serial number",
642 },{
643 .name = "file",
644 .type = QEMU_OPT_STRING,
645 .help = "file name",
646 },
647
648 /* Options that are passed on, but have special semantics with -drive */
649 {
650 .name = "read-only",
651 .type = QEMU_OPT_BOOL,
652 .help = "open drive file as read-only",
653 },{
654 .name = "rerror",
655 .type = QEMU_OPT_STRING,
656 .help = "read error action",
657 },{
658 .name = "werror",
659 .type = QEMU_OPT_STRING,
660 .help = "write error action",
661 },{
662 .name = "copy-on-read",
663 .type = QEMU_OPT_BOOL,
664 .help = "copy read data from backing file into image file",
665 },
666
667 { /* end of list */ }
668 },
669 };
670
671 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
672 {
673 const char *value;
674 BlockBackend *blk;
675 DriveInfo *dinfo = NULL;
676 QDict *bs_opts;
677 QemuOpts *legacy_opts;
678 DriveMediaType media = MEDIA_DISK;
679 BlockInterfaceType type;
680 int cyls, heads, secs, translation;
681 int max_devs, bus_id, unit_id, index;
682 const char *devaddr;
683 const char *werror, *rerror;
684 bool read_only = false;
685 bool copy_on_read;
686 const char *serial;
687 const char *filename;
688 Error *local_err = NULL;
689 int i;
690
691 /* Change legacy command line options into QMP ones */
692 static const struct {
693 const char *from;
694 const char *to;
695 } opt_renames[] = {
696 { "iops", "throttling.iops-total" },
697 { "iops_rd", "throttling.iops-read" },
698 { "iops_wr", "throttling.iops-write" },
699
700 { "bps", "throttling.bps-total" },
701 { "bps_rd", "throttling.bps-read" },
702 { "bps_wr", "throttling.bps-write" },
703
704 { "iops_max", "throttling.iops-total-max" },
705 { "iops_rd_max", "throttling.iops-read-max" },
706 { "iops_wr_max", "throttling.iops-write-max" },
707
708 { "bps_max", "throttling.bps-total-max" },
709 { "bps_rd_max", "throttling.bps-read-max" },
710 { "bps_wr_max", "throttling.bps-write-max" },
711
712 { "iops_size", "throttling.iops-size" },
713
714 { "readonly", "read-only" },
715 };
716
717 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
718 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
719 &local_err);
720 if (local_err) {
721 error_report_err(local_err);
722 return NULL;
723 }
724 }
725
726 value = qemu_opt_get(all_opts, "cache");
727 if (value) {
728 int flags = 0;
729
730 if (bdrv_parse_cache_flags(value, &flags) != 0) {
731 error_report("invalid cache option");
732 return NULL;
733 }
734
735 /* Specific options take precedence */
736 if (!qemu_opt_get(all_opts, "cache.writeback")) {
737 qemu_opt_set_bool(all_opts, "cache.writeback",
738 !!(flags & BDRV_O_CACHE_WB), &error_abort);
739 }
740 if (!qemu_opt_get(all_opts, "cache.direct")) {
741 qemu_opt_set_bool(all_opts, "cache.direct",
742 !!(flags & BDRV_O_NOCACHE), &error_abort);
743 }
744 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
745 qemu_opt_set_bool(all_opts, "cache.no-flush",
746 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
747 }
748 qemu_opt_unset(all_opts, "cache");
749 }
750
751 /* Get a QDict for processing the options */
752 bs_opts = qdict_new();
753 qemu_opts_to_qdict(all_opts, bs_opts);
754
755 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
756 &error_abort);
757 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
758 if (local_err) {
759 error_report_err(local_err);
760 goto fail;
761 }
762
763 /* Deprecated option boot=[on|off] */
764 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
765 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
766 "ignored. Future versions will reject this parameter. Please "
767 "update your scripts.\n");
768 }
769
770 /* Media type */
771 value = qemu_opt_get(legacy_opts, "media");
772 if (value) {
773 if (!strcmp(value, "disk")) {
774 media = MEDIA_DISK;
775 } else if (!strcmp(value, "cdrom")) {
776 media = MEDIA_CDROM;
777 read_only = true;
778 } else {
779 error_report("'%s' invalid media", value);
780 goto fail;
781 }
782 }
783
784 /* copy-on-read is disabled with a warning for read-only devices */
785 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
786 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
787
788 if (read_only && copy_on_read) {
789 error_report("warning: disabling copy-on-read on read-only drive");
790 copy_on_read = false;
791 }
792
793 qdict_put(bs_opts, "read-only",
794 qstring_from_str(read_only ? "on" : "off"));
795 qdict_put(bs_opts, "copy-on-read",
796 qstring_from_str(copy_on_read ? "on" :"off"));
797
798 /* Controller type */
799 value = qemu_opt_get(legacy_opts, "if");
800 if (value) {
801 for (type = 0;
802 type < IF_COUNT && strcmp(value, if_name[type]);
803 type++) {
804 }
805 if (type == IF_COUNT) {
806 error_report("unsupported bus type '%s'", value);
807 goto fail;
808 }
809 } else {
810 type = block_default_type;
811 }
812
813 /* Geometry */
814 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
815 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
816 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
817
818 if (cyls || heads || secs) {
819 if (cyls < 1) {
820 error_report("invalid physical cyls number");
821 goto fail;
822 }
823 if (heads < 1) {
824 error_report("invalid physical heads number");
825 goto fail;
826 }
827 if (secs < 1) {
828 error_report("invalid physical secs number");
829 goto fail;
830 }
831 }
832
833 translation = BIOS_ATA_TRANSLATION_AUTO;
834 value = qemu_opt_get(legacy_opts, "trans");
835 if (value != NULL) {
836 if (!cyls) {
837 error_report("'%s' trans must be used with cyls, heads and secs",
838 value);
839 goto fail;
840 }
841 if (!strcmp(value, "none")) {
842 translation = BIOS_ATA_TRANSLATION_NONE;
843 } else if (!strcmp(value, "lba")) {
844 translation = BIOS_ATA_TRANSLATION_LBA;
845 } else if (!strcmp(value, "large")) {
846 translation = BIOS_ATA_TRANSLATION_LARGE;
847 } else if (!strcmp(value, "rechs")) {
848 translation = BIOS_ATA_TRANSLATION_RECHS;
849 } else if (!strcmp(value, "auto")) {
850 translation = BIOS_ATA_TRANSLATION_AUTO;
851 } else {
852 error_report("'%s' invalid translation type", value);
853 goto fail;
854 }
855 }
856
857 if (media == MEDIA_CDROM) {
858 if (cyls || secs || heads) {
859 error_report("CHS can't be set with media=cdrom");
860 goto fail;
861 }
862 }
863
864 /* Device address specified by bus/unit or index.
865 * If none was specified, try to find the first free one. */
866 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
867 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
868 index = qemu_opt_get_number(legacy_opts, "index", -1);
869
870 max_devs = if_max_devs[type];
871
872 if (index != -1) {
873 if (bus_id != 0 || unit_id != -1) {
874 error_report("index cannot be used with bus and unit");
875 goto fail;
876 }
877 bus_id = drive_index_to_bus_id(type, index);
878 unit_id = drive_index_to_unit_id(type, index);
879 }
880
881 if (unit_id == -1) {
882 unit_id = 0;
883 while (drive_get(type, bus_id, unit_id) != NULL) {
884 unit_id++;
885 if (max_devs && unit_id >= max_devs) {
886 unit_id -= max_devs;
887 bus_id++;
888 }
889 }
890 }
891
892 if (max_devs && unit_id >= max_devs) {
893 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
894 goto fail;
895 }
896
897 if (drive_get(type, bus_id, unit_id) != NULL) {
898 error_report("drive with bus=%d, unit=%d (index=%d) exists",
899 bus_id, unit_id, index);
900 goto fail;
901 }
902
903 /* Serial number */
904 serial = qemu_opt_get(legacy_opts, "serial");
905
906 /* no id supplied -> create one */
907 if (qemu_opts_id(all_opts) == NULL) {
908 char *new_id;
909 const char *mediastr = "";
910 if (type == IF_IDE || type == IF_SCSI) {
911 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
912 }
913 if (max_devs) {
914 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
915 mediastr, unit_id);
916 } else {
917 new_id = g_strdup_printf("%s%s%i", if_name[type],
918 mediastr, unit_id);
919 }
920 qdict_put(bs_opts, "id", qstring_from_str(new_id));
921 g_free(new_id);
922 }
923
924 /* Add virtio block device */
925 devaddr = qemu_opt_get(legacy_opts, "addr");
926 if (devaddr && type != IF_VIRTIO) {
927 error_report("addr is not supported by this bus type");
928 goto fail;
929 }
930
931 if (type == IF_VIRTIO) {
932 QemuOpts *devopts;
933 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
934 &error_abort);
935 if (arch_type == QEMU_ARCH_S390X) {
936 qemu_opt_set(devopts, "driver", "virtio-blk-s390", &error_abort);
937 } else {
938 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
939 }
940 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
941 &error_abort);
942 if (devaddr) {
943 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
944 }
945 }
946
947 filename = qemu_opt_get(legacy_opts, "file");
948
949 /* Check werror/rerror compatibility with if=... */
950 werror = qemu_opt_get(legacy_opts, "werror");
951 if (werror != NULL) {
952 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
953 type != IF_NONE) {
954 error_report("werror is not supported by this bus type");
955 goto fail;
956 }
957 qdict_put(bs_opts, "werror", qstring_from_str(werror));
958 }
959
960 rerror = qemu_opt_get(legacy_opts, "rerror");
961 if (rerror != NULL) {
962 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
963 type != IF_NONE) {
964 error_report("rerror is not supported by this bus type");
965 goto fail;
966 }
967 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
968 }
969
970 /* Actual block device init: Functionality shared with blockdev-add */
971 blk = blockdev_init(filename, bs_opts, &local_err);
972 bs_opts = NULL;
973 if (!blk) {
974 if (local_err) {
975 error_report_err(local_err);
976 }
977 goto fail;
978 } else {
979 assert(!local_err);
980 }
981
982 /* Create legacy DriveInfo */
983 dinfo = g_malloc0(sizeof(*dinfo));
984 dinfo->opts = all_opts;
985
986 dinfo->cyls = cyls;
987 dinfo->heads = heads;
988 dinfo->secs = secs;
989 dinfo->trans = translation;
990
991 dinfo->type = type;
992 dinfo->bus = bus_id;
993 dinfo->unit = unit_id;
994 dinfo->devaddr = devaddr;
995 dinfo->serial = g_strdup(serial);
996
997 blk_set_legacy_dinfo(blk, dinfo);
998
999 switch(type) {
1000 case IF_IDE:
1001 case IF_SCSI:
1002 case IF_XEN:
1003 case IF_NONE:
1004 dinfo->media_cd = media == MEDIA_CDROM;
1005 break;
1006 default:
1007 break;
1008 }
1009
1010 fail:
1011 qemu_opts_del(legacy_opts);
1012 QDECREF(bs_opts);
1013 return dinfo;
1014 }
1015
1016 void hmp_commit(Monitor *mon, const QDict *qdict)
1017 {
1018 const char *device = qdict_get_str(qdict, "device");
1019 BlockBackend *blk;
1020 int ret;
1021
1022 if (!strcmp(device, "all")) {
1023 ret = bdrv_commit_all();
1024 } else {
1025 blk = blk_by_name(device);
1026 if (!blk) {
1027 monitor_printf(mon, "Device '%s' not found\n", device);
1028 return;
1029 }
1030 ret = bdrv_commit(blk_bs(blk));
1031 }
1032 if (ret < 0) {
1033 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1034 strerror(-ret));
1035 }
1036 }
1037
1038 static void blockdev_do_action(int kind, void *data, Error **errp)
1039 {
1040 TransactionAction action;
1041 TransactionActionList list;
1042
1043 action.kind = kind;
1044 action.data = data;
1045 list.value = &action;
1046 list.next = NULL;
1047 qmp_transaction(&list, errp);
1048 }
1049
1050 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1051 bool has_node_name, const char *node_name,
1052 const char *snapshot_file,
1053 bool has_snapshot_node_name,
1054 const char *snapshot_node_name,
1055 bool has_format, const char *format,
1056 bool has_mode, NewImageMode mode, Error **errp)
1057 {
1058 BlockdevSnapshot snapshot = {
1059 .has_device = has_device,
1060 .device = (char *) device,
1061 .has_node_name = has_node_name,
1062 .node_name = (char *) node_name,
1063 .snapshot_file = (char *) snapshot_file,
1064 .has_snapshot_node_name = has_snapshot_node_name,
1065 .snapshot_node_name = (char *) snapshot_node_name,
1066 .has_format = has_format,
1067 .format = (char *) format,
1068 .has_mode = has_mode,
1069 .mode = mode,
1070 };
1071 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1072 &snapshot, errp);
1073 }
1074
1075 void qmp_blockdev_snapshot_internal_sync(const char *device,
1076 const char *name,
1077 Error **errp)
1078 {
1079 BlockdevSnapshotInternal snapshot = {
1080 .device = (char *) device,
1081 .name = (char *) name
1082 };
1083
1084 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1085 &snapshot, errp);
1086 }
1087
1088 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1089 bool has_id,
1090 const char *id,
1091 bool has_name,
1092 const char *name,
1093 Error **errp)
1094 {
1095 BlockDriverState *bs;
1096 BlockBackend *blk;
1097 AioContext *aio_context;
1098 QEMUSnapshotInfo sn;
1099 Error *local_err = NULL;
1100 SnapshotInfo *info = NULL;
1101 int ret;
1102
1103 blk = blk_by_name(device);
1104 if (!blk) {
1105 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1106 return NULL;
1107 }
1108 bs = blk_bs(blk);
1109
1110 if (!has_id) {
1111 id = NULL;
1112 }
1113
1114 if (!has_name) {
1115 name = NULL;
1116 }
1117
1118 if (!id && !name) {
1119 error_setg(errp, "Name or id must be provided");
1120 return NULL;
1121 }
1122
1123 aio_context = bdrv_get_aio_context(bs);
1124 aio_context_acquire(aio_context);
1125
1126 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1127 goto out_aio_context;
1128 }
1129
1130 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1131 if (local_err) {
1132 error_propagate(errp, local_err);
1133 goto out_aio_context;
1134 }
1135 if (!ret) {
1136 error_setg(errp,
1137 "Snapshot with id '%s' and name '%s' does not exist on "
1138 "device '%s'",
1139 STR_OR_NULL(id), STR_OR_NULL(name), device);
1140 goto out_aio_context;
1141 }
1142
1143 bdrv_snapshot_delete(bs, id, name, &local_err);
1144 if (local_err) {
1145 error_propagate(errp, local_err);
1146 goto out_aio_context;
1147 }
1148
1149 aio_context_release(aio_context);
1150
1151 info = g_new0(SnapshotInfo, 1);
1152 info->id = g_strdup(sn.id_str);
1153 info->name = g_strdup(sn.name);
1154 info->date_nsec = sn.date_nsec;
1155 info->date_sec = sn.date_sec;
1156 info->vm_state_size = sn.vm_state_size;
1157 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1158 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1159
1160 return info;
1161
1162 out_aio_context:
1163 aio_context_release(aio_context);
1164 return NULL;
1165 }
1166
1167 /* New and old BlockDriverState structs for atomic group operations */
1168
1169 typedef struct BlkTransactionState BlkTransactionState;
1170
1171 /* Only prepare() may fail. In a single transaction, only one of commit() or
1172 abort() will be called, clean() will always be called if it present. */
1173 typedef struct BdrvActionOps {
1174 /* Size of state struct, in bytes. */
1175 size_t instance_size;
1176 /* Prepare the work, must NOT be NULL. */
1177 void (*prepare)(BlkTransactionState *common, Error **errp);
1178 /* Commit the changes, can be NULL. */
1179 void (*commit)(BlkTransactionState *common);
1180 /* Abort the changes on fail, can be NULL. */
1181 void (*abort)(BlkTransactionState *common);
1182 /* Clean up resource in the end, can be NULL. */
1183 void (*clean)(BlkTransactionState *common);
1184 } BdrvActionOps;
1185
1186 /*
1187 * This structure must be arranged as first member in child type, assuming
1188 * that compiler will also arrange it to the same address with parent instance.
1189 * Later it will be used in free().
1190 */
1191 struct BlkTransactionState {
1192 TransactionAction *action;
1193 const BdrvActionOps *ops;
1194 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1195 };
1196
1197 /* internal snapshot private data */
1198 typedef struct InternalSnapshotState {
1199 BlkTransactionState common;
1200 BlockDriverState *bs;
1201 AioContext *aio_context;
1202 QEMUSnapshotInfo sn;
1203 } InternalSnapshotState;
1204
1205 static void internal_snapshot_prepare(BlkTransactionState *common,
1206 Error **errp)
1207 {
1208 Error *local_err = NULL;
1209 const char *device;
1210 const char *name;
1211 BlockBackend *blk;
1212 BlockDriverState *bs;
1213 QEMUSnapshotInfo old_sn, *sn;
1214 bool ret;
1215 qemu_timeval tv;
1216 BlockdevSnapshotInternal *internal;
1217 InternalSnapshotState *state;
1218 int ret1;
1219
1220 g_assert(common->action->kind ==
1221 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1222 internal = common->action->blockdev_snapshot_internal_sync;
1223 state = DO_UPCAST(InternalSnapshotState, common, common);
1224
1225 /* 1. parse input */
1226 device = internal->device;
1227 name = internal->name;
1228
1229 /* 2. check for validation */
1230 blk = blk_by_name(device);
1231 if (!blk) {
1232 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1233 return;
1234 }
1235 bs = blk_bs(blk);
1236
1237 /* AioContext is released in .clean() */
1238 state->aio_context = bdrv_get_aio_context(bs);
1239 aio_context_acquire(state->aio_context);
1240
1241 if (!bdrv_is_inserted(bs)) {
1242 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1243 return;
1244 }
1245
1246 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1247 return;
1248 }
1249
1250 if (bdrv_is_read_only(bs)) {
1251 error_setg(errp, "Device '%s' is read only", device);
1252 return;
1253 }
1254
1255 if (!bdrv_can_snapshot(bs)) {
1256 error_setg(errp, "Block format '%s' used by device '%s' "
1257 "does not support internal snapshots",
1258 bs->drv->format_name, device);
1259 return;
1260 }
1261
1262 if (!strlen(name)) {
1263 error_setg(errp, "Name is empty");
1264 return;
1265 }
1266
1267 /* check whether a snapshot with name exist */
1268 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1269 &local_err);
1270 if (local_err) {
1271 error_propagate(errp, local_err);
1272 return;
1273 } else if (ret) {
1274 error_setg(errp,
1275 "Snapshot with name '%s' already exists on device '%s'",
1276 name, device);
1277 return;
1278 }
1279
1280 /* 3. take the snapshot */
1281 sn = &state->sn;
1282 pstrcpy(sn->name, sizeof(sn->name), name);
1283 qemu_gettimeofday(&tv);
1284 sn->date_sec = tv.tv_sec;
1285 sn->date_nsec = tv.tv_usec * 1000;
1286 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1287
1288 ret1 = bdrv_snapshot_create(bs, sn);
1289 if (ret1 < 0) {
1290 error_setg_errno(errp, -ret1,
1291 "Failed to create snapshot '%s' on device '%s'",
1292 name, device);
1293 return;
1294 }
1295
1296 /* 4. succeed, mark a snapshot is created */
1297 state->bs = bs;
1298 }
1299
1300 static void internal_snapshot_abort(BlkTransactionState *common)
1301 {
1302 InternalSnapshotState *state =
1303 DO_UPCAST(InternalSnapshotState, common, common);
1304 BlockDriverState *bs = state->bs;
1305 QEMUSnapshotInfo *sn = &state->sn;
1306 Error *local_error = NULL;
1307
1308 if (!bs) {
1309 return;
1310 }
1311
1312 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1313 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1314 "device '%s' in abort: %s",
1315 sn->id_str,
1316 sn->name,
1317 bdrv_get_device_name(bs),
1318 error_get_pretty(local_error));
1319 error_free(local_error);
1320 }
1321 }
1322
1323 static void internal_snapshot_clean(BlkTransactionState *common)
1324 {
1325 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1326 common, common);
1327
1328 if (state->aio_context) {
1329 aio_context_release(state->aio_context);
1330 }
1331 }
1332
1333 /* external snapshot private data */
1334 typedef struct ExternalSnapshotState {
1335 BlkTransactionState common;
1336 BlockDriverState *old_bs;
1337 BlockDriverState *new_bs;
1338 AioContext *aio_context;
1339 } ExternalSnapshotState;
1340
1341 static void external_snapshot_prepare(BlkTransactionState *common,
1342 Error **errp)
1343 {
1344 BlockDriver *drv;
1345 int flags, ret;
1346 QDict *options = NULL;
1347 Error *local_err = NULL;
1348 bool has_device = false;
1349 const char *device;
1350 bool has_node_name = false;
1351 const char *node_name;
1352 bool has_snapshot_node_name = false;
1353 const char *snapshot_node_name;
1354 const char *new_image_file;
1355 const char *format = "qcow2";
1356 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1357 ExternalSnapshotState *state =
1358 DO_UPCAST(ExternalSnapshotState, common, common);
1359 TransactionAction *action = common->action;
1360
1361 /* get parameters */
1362 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1363
1364 has_device = action->blockdev_snapshot_sync->has_device;
1365 device = action->blockdev_snapshot_sync->device;
1366 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1367 node_name = action->blockdev_snapshot_sync->node_name;
1368 has_snapshot_node_name =
1369 action->blockdev_snapshot_sync->has_snapshot_node_name;
1370 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1371
1372 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1373 if (action->blockdev_snapshot_sync->has_format) {
1374 format = action->blockdev_snapshot_sync->format;
1375 }
1376 if (action->blockdev_snapshot_sync->has_mode) {
1377 mode = action->blockdev_snapshot_sync->mode;
1378 }
1379
1380 /* start processing */
1381 drv = bdrv_find_format(format);
1382 if (!drv) {
1383 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1384 return;
1385 }
1386
1387 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1388 has_node_name ? node_name : NULL,
1389 &local_err);
1390 if (local_err) {
1391 error_propagate(errp, local_err);
1392 return;
1393 }
1394
1395 if (has_node_name && !has_snapshot_node_name) {
1396 error_setg(errp, "New snapshot node name missing");
1397 return;
1398 }
1399
1400 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1401 error_setg(errp, "New snapshot node name already existing");
1402 return;
1403 }
1404
1405 /* Acquire AioContext now so any threads operating on old_bs stop */
1406 state->aio_context = bdrv_get_aio_context(state->old_bs);
1407 aio_context_acquire(state->aio_context);
1408
1409 if (!bdrv_is_inserted(state->old_bs)) {
1410 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1411 return;
1412 }
1413
1414 if (bdrv_op_is_blocked(state->old_bs,
1415 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1416 return;
1417 }
1418
1419 if (!bdrv_is_read_only(state->old_bs)) {
1420 if (bdrv_flush(state->old_bs)) {
1421 error_set(errp, QERR_IO_ERROR);
1422 return;
1423 }
1424 }
1425
1426 if (!bdrv_is_first_non_filter(state->old_bs)) {
1427 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1428 return;
1429 }
1430
1431 flags = state->old_bs->open_flags;
1432
1433 /* create new image w/backing file */
1434 if (mode != NEW_IMAGE_MODE_EXISTING) {
1435 bdrv_img_create(new_image_file, format,
1436 state->old_bs->filename,
1437 state->old_bs->drv->format_name,
1438 NULL, -1, flags, &local_err, false);
1439 if (local_err) {
1440 error_propagate(errp, local_err);
1441 return;
1442 }
1443 }
1444
1445 if (has_snapshot_node_name) {
1446 options = qdict_new();
1447 qdict_put(options, "node-name",
1448 qstring_from_str(snapshot_node_name));
1449 }
1450
1451 /* TODO Inherit bs->options or only take explicit options with an
1452 * extended QMP command? */
1453 assert(state->new_bs == NULL);
1454 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1455 flags | BDRV_O_NO_BACKING, drv, &local_err);
1456 /* We will manually add the backing_hd field to the bs later */
1457 if (ret != 0) {
1458 error_propagate(errp, local_err);
1459 }
1460 }
1461
1462 static void external_snapshot_commit(BlkTransactionState *common)
1463 {
1464 ExternalSnapshotState *state =
1465 DO_UPCAST(ExternalSnapshotState, common, common);
1466
1467 bdrv_set_aio_context(state->new_bs, state->aio_context);
1468
1469 /* This removes our old bs and adds the new bs */
1470 bdrv_append(state->new_bs, state->old_bs);
1471 /* We don't need (or want) to use the transactional
1472 * bdrv_reopen_multiple() across all the entries at once, because we
1473 * don't want to abort all of them if one of them fails the reopen */
1474 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1475 NULL);
1476
1477 aio_context_release(state->aio_context);
1478 }
1479
1480 static void external_snapshot_abort(BlkTransactionState *common)
1481 {
1482 ExternalSnapshotState *state =
1483 DO_UPCAST(ExternalSnapshotState, common, common);
1484 if (state->new_bs) {
1485 bdrv_unref(state->new_bs);
1486 }
1487 if (state->aio_context) {
1488 aio_context_release(state->aio_context);
1489 }
1490 }
1491
1492 typedef struct DriveBackupState {
1493 BlkTransactionState common;
1494 BlockDriverState *bs;
1495 AioContext *aio_context;
1496 BlockJob *job;
1497 } DriveBackupState;
1498
1499 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1500 {
1501 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1502 BlockDriverState *bs;
1503 BlockBackend *blk;
1504 DriveBackup *backup;
1505 Error *local_err = NULL;
1506
1507 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1508 backup = common->action->drive_backup;
1509
1510 blk = blk_by_name(backup->device);
1511 if (!blk) {
1512 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device);
1513 return;
1514 }
1515 bs = blk_bs(blk);
1516
1517 /* AioContext is released in .clean() */
1518 state->aio_context = bdrv_get_aio_context(bs);
1519 aio_context_acquire(state->aio_context);
1520
1521 qmp_drive_backup(backup->device, backup->target,
1522 backup->has_format, backup->format,
1523 backup->sync,
1524 backup->has_mode, backup->mode,
1525 backup->has_speed, backup->speed,
1526 backup->has_on_source_error, backup->on_source_error,
1527 backup->has_on_target_error, backup->on_target_error,
1528 &local_err);
1529 if (local_err) {
1530 error_propagate(errp, local_err);
1531 return;
1532 }
1533
1534 state->bs = bs;
1535 state->job = state->bs->job;
1536 }
1537
1538 static void drive_backup_abort(BlkTransactionState *common)
1539 {
1540 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1541 BlockDriverState *bs = state->bs;
1542
1543 /* Only cancel if it's the job we started */
1544 if (bs && bs->job && bs->job == state->job) {
1545 block_job_cancel_sync(bs->job);
1546 }
1547 }
1548
1549 static void drive_backup_clean(BlkTransactionState *common)
1550 {
1551 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1552
1553 if (state->aio_context) {
1554 aio_context_release(state->aio_context);
1555 }
1556 }
1557
1558 typedef struct BlockdevBackupState {
1559 BlkTransactionState common;
1560 BlockDriverState *bs;
1561 BlockJob *job;
1562 AioContext *aio_context;
1563 } BlockdevBackupState;
1564
1565 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1566 {
1567 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1568 BlockdevBackup *backup;
1569 BlockDriverState *bs, *target;
1570 BlockBackend *blk;
1571 Error *local_err = NULL;
1572
1573 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1574 backup = common->action->blockdev_backup;
1575
1576 blk = blk_by_name(backup->device);
1577 if (!blk) {
1578 error_setg(errp, "Device '%s' not found", backup->device);
1579 return;
1580 }
1581 bs = blk_bs(blk);
1582
1583 blk = blk_by_name(backup->target);
1584 if (!blk) {
1585 error_setg(errp, "Device '%s' not found", backup->target);
1586 return;
1587 }
1588 target = blk_bs(blk);
1589
1590 /* AioContext is released in .clean() */
1591 state->aio_context = bdrv_get_aio_context(bs);
1592 if (state->aio_context != bdrv_get_aio_context(target)) {
1593 state->aio_context = NULL;
1594 error_setg(errp, "Backup between two IO threads is not implemented");
1595 return;
1596 }
1597 aio_context_acquire(state->aio_context);
1598
1599 qmp_blockdev_backup(backup->device, backup->target,
1600 backup->sync,
1601 backup->has_speed, backup->speed,
1602 backup->has_on_source_error, backup->on_source_error,
1603 backup->has_on_target_error, backup->on_target_error,
1604 &local_err);
1605 if (local_err) {
1606 error_propagate(errp, local_err);
1607 return;
1608 }
1609
1610 state->bs = bs;
1611 state->job = state->bs->job;
1612 }
1613
1614 static void blockdev_backup_abort(BlkTransactionState *common)
1615 {
1616 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1617 BlockDriverState *bs = state->bs;
1618
1619 /* Only cancel if it's the job we started */
1620 if (bs && bs->job && bs->job == state->job) {
1621 block_job_cancel_sync(bs->job);
1622 }
1623 }
1624
1625 static void blockdev_backup_clean(BlkTransactionState *common)
1626 {
1627 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1628
1629 if (state->aio_context) {
1630 aio_context_release(state->aio_context);
1631 }
1632 }
1633
1634 static void abort_prepare(BlkTransactionState *common, Error **errp)
1635 {
1636 error_setg(errp, "Transaction aborted using Abort action");
1637 }
1638
1639 static void abort_commit(BlkTransactionState *common)
1640 {
1641 g_assert_not_reached(); /* this action never succeeds */
1642 }
1643
1644 static const BdrvActionOps actions[] = {
1645 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1646 .instance_size = sizeof(ExternalSnapshotState),
1647 .prepare = external_snapshot_prepare,
1648 .commit = external_snapshot_commit,
1649 .abort = external_snapshot_abort,
1650 },
1651 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1652 .instance_size = sizeof(DriveBackupState),
1653 .prepare = drive_backup_prepare,
1654 .abort = drive_backup_abort,
1655 .clean = drive_backup_clean,
1656 },
1657 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1658 .instance_size = sizeof(BlockdevBackupState),
1659 .prepare = blockdev_backup_prepare,
1660 .abort = blockdev_backup_abort,
1661 .clean = blockdev_backup_clean,
1662 },
1663 [TRANSACTION_ACTION_KIND_ABORT] = {
1664 .instance_size = sizeof(BlkTransactionState),
1665 .prepare = abort_prepare,
1666 .commit = abort_commit,
1667 },
1668 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1669 .instance_size = sizeof(InternalSnapshotState),
1670 .prepare = internal_snapshot_prepare,
1671 .abort = internal_snapshot_abort,
1672 .clean = internal_snapshot_clean,
1673 },
1674 };
1675
1676 /*
1677 * 'Atomic' group operations. The operations are performed as a set, and if
1678 * any fail then we roll back all operations in the group.
1679 */
1680 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1681 {
1682 TransactionActionList *dev_entry = dev_list;
1683 BlkTransactionState *state, *next;
1684 Error *local_err = NULL;
1685
1686 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1687 QSIMPLEQ_INIT(&snap_bdrv_states);
1688
1689 /* drain all i/o before any operations */
1690 bdrv_drain_all();
1691
1692 /* We don't do anything in this loop that commits us to the operations */
1693 while (NULL != dev_entry) {
1694 TransactionAction *dev_info = NULL;
1695 const BdrvActionOps *ops;
1696
1697 dev_info = dev_entry->value;
1698 dev_entry = dev_entry->next;
1699
1700 assert(dev_info->kind < ARRAY_SIZE(actions));
1701
1702 ops = &actions[dev_info->kind];
1703 assert(ops->instance_size > 0);
1704
1705 state = g_malloc0(ops->instance_size);
1706 state->ops = ops;
1707 state->action = dev_info;
1708 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1709
1710 state->ops->prepare(state, &local_err);
1711 if (local_err) {
1712 error_propagate(errp, local_err);
1713 goto delete_and_fail;
1714 }
1715 }
1716
1717 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1718 if (state->ops->commit) {
1719 state->ops->commit(state);
1720 }
1721 }
1722
1723 /* success */
1724 goto exit;
1725
1726 delete_and_fail:
1727 /* failure, and it is all-or-none; roll back all operations */
1728 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1729 if (state->ops->abort) {
1730 state->ops->abort(state);
1731 }
1732 }
1733 exit:
1734 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1735 if (state->ops->clean) {
1736 state->ops->clean(state);
1737 }
1738 g_free(state);
1739 }
1740 }
1741
1742
1743 static void eject_device(BlockBackend *blk, int force, Error **errp)
1744 {
1745 BlockDriverState *bs = blk_bs(blk);
1746 AioContext *aio_context;
1747
1748 aio_context = bdrv_get_aio_context(bs);
1749 aio_context_acquire(aio_context);
1750
1751 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1752 goto out;
1753 }
1754 if (!blk_dev_has_removable_media(blk)) {
1755 error_setg(errp, "Device '%s' is not removable",
1756 bdrv_get_device_name(bs));
1757 goto out;
1758 }
1759
1760 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1761 blk_dev_eject_request(blk, force);
1762 if (!force) {
1763 error_setg(errp, "Device '%s' is locked",
1764 bdrv_get_device_name(bs));
1765 goto out;
1766 }
1767 }
1768
1769 bdrv_close(bs);
1770
1771 out:
1772 aio_context_release(aio_context);
1773 }
1774
1775 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1776 {
1777 BlockBackend *blk;
1778
1779 blk = blk_by_name(device);
1780 if (!blk) {
1781 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1782 return;
1783 }
1784
1785 eject_device(blk, force, errp);
1786 }
1787
1788 void qmp_block_passwd(bool has_device, const char *device,
1789 bool has_node_name, const char *node_name,
1790 const char *password, Error **errp)
1791 {
1792 Error *local_err = NULL;
1793 BlockDriverState *bs;
1794 AioContext *aio_context;
1795
1796 bs = bdrv_lookup_bs(has_device ? device : NULL,
1797 has_node_name ? node_name : NULL,
1798 &local_err);
1799 if (local_err) {
1800 error_propagate(errp, local_err);
1801 return;
1802 }
1803
1804 aio_context = bdrv_get_aio_context(bs);
1805 aio_context_acquire(aio_context);
1806
1807 bdrv_add_key(bs, password, errp);
1808
1809 aio_context_release(aio_context);
1810 }
1811
1812 /* Assumes AioContext is held */
1813 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1814 int bdrv_flags, BlockDriver *drv,
1815 const char *password, Error **errp)
1816 {
1817 Error *local_err = NULL;
1818 int ret;
1819
1820 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1821 if (ret < 0) {
1822 error_propagate(errp, local_err);
1823 return;
1824 }
1825
1826 bdrv_add_key(bs, password, errp);
1827 }
1828
1829 void qmp_change_blockdev(const char *device, const char *filename,
1830 const char *format, Error **errp)
1831 {
1832 BlockBackend *blk;
1833 BlockDriverState *bs;
1834 AioContext *aio_context;
1835 BlockDriver *drv = NULL;
1836 int bdrv_flags;
1837 Error *err = NULL;
1838
1839 blk = blk_by_name(device);
1840 if (!blk) {
1841 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1842 return;
1843 }
1844 bs = blk_bs(blk);
1845
1846 aio_context = bdrv_get_aio_context(bs);
1847 aio_context_acquire(aio_context);
1848
1849 if (format) {
1850 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1851 if (!drv) {
1852 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1853 goto out;
1854 }
1855 }
1856
1857 eject_device(blk, 0, &err);
1858 if (err) {
1859 error_propagate(errp, err);
1860 goto out;
1861 }
1862
1863 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1864 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1865
1866 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1867
1868 out:
1869 aio_context_release(aio_context);
1870 }
1871
1872 /* throttling disk I/O limits */
1873 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1874 int64_t bps_wr,
1875 int64_t iops,
1876 int64_t iops_rd,
1877 int64_t iops_wr,
1878 bool has_bps_max,
1879 int64_t bps_max,
1880 bool has_bps_rd_max,
1881 int64_t bps_rd_max,
1882 bool has_bps_wr_max,
1883 int64_t bps_wr_max,
1884 bool has_iops_max,
1885 int64_t iops_max,
1886 bool has_iops_rd_max,
1887 int64_t iops_rd_max,
1888 bool has_iops_wr_max,
1889 int64_t iops_wr_max,
1890 bool has_iops_size,
1891 int64_t iops_size, Error **errp)
1892 {
1893 ThrottleConfig cfg;
1894 BlockDriverState *bs;
1895 BlockBackend *blk;
1896 AioContext *aio_context;
1897
1898 blk = blk_by_name(device);
1899 if (!blk) {
1900 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1901 return;
1902 }
1903 bs = blk_bs(blk);
1904
1905 memset(&cfg, 0, sizeof(cfg));
1906 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1907 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1908 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1909
1910 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1911 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1912 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1913
1914 if (has_bps_max) {
1915 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1916 }
1917 if (has_bps_rd_max) {
1918 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1919 }
1920 if (has_bps_wr_max) {
1921 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1922 }
1923 if (has_iops_max) {
1924 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1925 }
1926 if (has_iops_rd_max) {
1927 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1928 }
1929 if (has_iops_wr_max) {
1930 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1931 }
1932
1933 if (has_iops_size) {
1934 cfg.op_size = iops_size;
1935 }
1936
1937 if (!check_throttle_config(&cfg, errp)) {
1938 return;
1939 }
1940
1941 aio_context = bdrv_get_aio_context(bs);
1942 aio_context_acquire(aio_context);
1943
1944 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1945 bdrv_io_limits_enable(bs);
1946 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1947 bdrv_io_limits_disable(bs);
1948 }
1949
1950 if (bs->io_limits_enabled) {
1951 bdrv_set_io_limits(bs, &cfg);
1952 }
1953
1954 aio_context_release(aio_context);
1955 }
1956
1957 int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1958 {
1959 const char *id = qdict_get_str(qdict, "id");
1960 BlockBackend *blk;
1961 BlockDriverState *bs;
1962 AioContext *aio_context;
1963 Error *local_err = NULL;
1964
1965 blk = blk_by_name(id);
1966 if (!blk) {
1967 error_report("Device '%s' not found", id);
1968 return -1;
1969 }
1970 bs = blk_bs(blk);
1971
1972 if (!blk_legacy_dinfo(blk)) {
1973 error_report("Deleting device added with blockdev-add"
1974 " is not supported");
1975 return -1;
1976 }
1977
1978 aio_context = bdrv_get_aio_context(bs);
1979 aio_context_acquire(aio_context);
1980
1981 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
1982 error_report_err(local_err);
1983 aio_context_release(aio_context);
1984 return -1;
1985 }
1986
1987 /* quiesce block driver; prevent further io */
1988 bdrv_drain_all();
1989 bdrv_flush(bs);
1990 bdrv_close(bs);
1991
1992 /* if we have a device attached to this BlockDriverState
1993 * then we need to make the drive anonymous until the device
1994 * can be removed. If this is a drive with no device backing
1995 * then we can just get rid of the block driver state right here.
1996 */
1997 if (blk_get_attached_dev(blk)) {
1998 blk_hide_on_behalf_of_hmp_drive_del(blk);
1999 /* Further I/O must not pause the guest */
2000 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
2001 BLOCKDEV_ON_ERROR_REPORT);
2002 } else {
2003 blk_unref(blk);
2004 }
2005
2006 aio_context_release(aio_context);
2007 return 0;
2008 }
2009
2010 void qmp_block_resize(bool has_device, const char *device,
2011 bool has_node_name, const char *node_name,
2012 int64_t size, Error **errp)
2013 {
2014 Error *local_err = NULL;
2015 BlockDriverState *bs;
2016 AioContext *aio_context;
2017 int ret;
2018
2019 bs = bdrv_lookup_bs(has_device ? device : NULL,
2020 has_node_name ? node_name : NULL,
2021 &local_err);
2022 if (local_err) {
2023 error_propagate(errp, local_err);
2024 return;
2025 }
2026
2027 aio_context = bdrv_get_aio_context(bs);
2028 aio_context_acquire(aio_context);
2029
2030 if (!bdrv_is_first_non_filter(bs)) {
2031 error_set(errp, QERR_FEATURE_DISABLED, "resize");
2032 goto out;
2033 }
2034
2035 if (size < 0) {
2036 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2037 goto out;
2038 }
2039
2040 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2041 error_set(errp, QERR_DEVICE_IN_USE, device);
2042 goto out;
2043 }
2044
2045 /* complete all in-flight operations before resizing the device */
2046 bdrv_drain_all();
2047
2048 ret = bdrv_truncate(bs, size);
2049 switch (ret) {
2050 case 0:
2051 break;
2052 case -ENOMEDIUM:
2053 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2054 break;
2055 case -ENOTSUP:
2056 error_set(errp, QERR_UNSUPPORTED);
2057 break;
2058 case -EACCES:
2059 error_setg(errp, "Device '%s' is read only", device);
2060 break;
2061 case -EBUSY:
2062 error_set(errp, QERR_DEVICE_IN_USE, device);
2063 break;
2064 default:
2065 error_setg_errno(errp, -ret, "Could not resize");
2066 break;
2067 }
2068
2069 out:
2070 aio_context_release(aio_context);
2071 }
2072
2073 static void block_job_cb(void *opaque, int ret)
2074 {
2075 /* Note that this function may be executed from another AioContext besides
2076 * the QEMU main loop. If you need to access anything that assumes the
2077 * QEMU global mutex, use a BH or introduce a mutex.
2078 */
2079
2080 BlockDriverState *bs = opaque;
2081 const char *msg = NULL;
2082
2083 trace_block_job_cb(bs, bs->job, ret);
2084
2085 assert(bs->job);
2086
2087 if (ret < 0) {
2088 msg = strerror(-ret);
2089 }
2090
2091 if (block_job_is_cancelled(bs->job)) {
2092 block_job_event_cancelled(bs->job);
2093 } else {
2094 block_job_event_completed(bs->job, msg);
2095 }
2096
2097 bdrv_put_ref_bh_schedule(bs);
2098 }
2099
2100 void qmp_block_stream(const char *device,
2101 bool has_base, const char *base,
2102 bool has_backing_file, const char *backing_file,
2103 bool has_speed, int64_t speed,
2104 bool has_on_error, BlockdevOnError on_error,
2105 Error **errp)
2106 {
2107 BlockBackend *blk;
2108 BlockDriverState *bs;
2109 BlockDriverState *base_bs = NULL;
2110 AioContext *aio_context;
2111 Error *local_err = NULL;
2112 const char *base_name = NULL;
2113
2114 if (!has_on_error) {
2115 on_error = BLOCKDEV_ON_ERROR_REPORT;
2116 }
2117
2118 blk = blk_by_name(device);
2119 if (!blk) {
2120 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2121 return;
2122 }
2123 bs = blk_bs(blk);
2124
2125 aio_context = bdrv_get_aio_context(bs);
2126 aio_context_acquire(aio_context);
2127
2128 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2129 goto out;
2130 }
2131
2132 if (has_base) {
2133 base_bs = bdrv_find_backing_image(bs, base);
2134 if (base_bs == NULL) {
2135 error_set(errp, QERR_BASE_NOT_FOUND, base);
2136 goto out;
2137 }
2138 assert(bdrv_get_aio_context(base_bs) == aio_context);
2139 base_name = base;
2140 }
2141
2142 /* if we are streaming the entire chain, the result will have no backing
2143 * file, and specifying one is therefore an error */
2144 if (base_bs == NULL && has_backing_file) {
2145 error_setg(errp, "backing file specified, but streaming the "
2146 "entire chain");
2147 goto out;
2148 }
2149
2150 /* backing_file string overrides base bs filename */
2151 base_name = has_backing_file ? backing_file : base_name;
2152
2153 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2154 on_error, block_job_cb, bs, &local_err);
2155 if (local_err) {
2156 error_propagate(errp, local_err);
2157 goto out;
2158 }
2159
2160 trace_qmp_block_stream(bs, bs->job);
2161
2162 out:
2163 aio_context_release(aio_context);
2164 }
2165
2166 void qmp_block_commit(const char *device,
2167 bool has_base, const char *base,
2168 bool has_top, const char *top,
2169 bool has_backing_file, const char *backing_file,
2170 bool has_speed, int64_t speed,
2171 Error **errp)
2172 {
2173 BlockBackend *blk;
2174 BlockDriverState *bs;
2175 BlockDriverState *base_bs, *top_bs;
2176 AioContext *aio_context;
2177 Error *local_err = NULL;
2178 /* This will be part of the QMP command, if/when the
2179 * BlockdevOnError change for blkmirror makes it in
2180 */
2181 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2182
2183 if (!has_speed) {
2184 speed = 0;
2185 }
2186
2187 /* Important Note:
2188 * libvirt relies on the DeviceNotFound error class in order to probe for
2189 * live commit feature versions; for this to work, we must make sure to
2190 * perform the device lookup before any generic errors that may occur in a
2191 * scenario in which all optional arguments are omitted. */
2192 blk = blk_by_name(device);
2193 if (!blk) {
2194 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2195 return;
2196 }
2197 bs = blk_bs(blk);
2198
2199 aio_context = bdrv_get_aio_context(bs);
2200 aio_context_acquire(aio_context);
2201
2202 /* drain all i/o before commits */
2203 bdrv_drain_all();
2204
2205 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2206 goto out;
2207 }
2208
2209 /* default top_bs is the active layer */
2210 top_bs = bs;
2211
2212 if (has_top && top) {
2213 if (strcmp(bs->filename, top) != 0) {
2214 top_bs = bdrv_find_backing_image(bs, top);
2215 }
2216 }
2217
2218 if (top_bs == NULL) {
2219 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2220 goto out;
2221 }
2222
2223 assert(bdrv_get_aio_context(top_bs) == aio_context);
2224
2225 if (has_base && base) {
2226 base_bs = bdrv_find_backing_image(top_bs, base);
2227 } else {
2228 base_bs = bdrv_find_base(top_bs);
2229 }
2230
2231 if (base_bs == NULL) {
2232 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2233 goto out;
2234 }
2235
2236 assert(bdrv_get_aio_context(base_bs) == aio_context);
2237
2238 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2239 goto out;
2240 }
2241
2242 /* Do not allow attempts to commit an image into itself */
2243 if (top_bs == base_bs) {
2244 error_setg(errp, "cannot commit an image into itself");
2245 goto out;
2246 }
2247
2248 if (top_bs == bs) {
2249 if (has_backing_file) {
2250 error_setg(errp, "'backing-file' specified,"
2251 " but 'top' is the active layer");
2252 goto out;
2253 }
2254 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2255 bs, &local_err);
2256 } else {
2257 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2258 has_backing_file ? backing_file : NULL, &local_err);
2259 }
2260 if (local_err != NULL) {
2261 error_propagate(errp, local_err);
2262 goto out;
2263 }
2264
2265 out:
2266 aio_context_release(aio_context);
2267 }
2268
2269 void qmp_drive_backup(const char *device, const char *target,
2270 bool has_format, const char *format,
2271 enum MirrorSyncMode sync,
2272 bool has_mode, enum NewImageMode mode,
2273 bool has_speed, int64_t speed,
2274 bool has_on_source_error, BlockdevOnError on_source_error,
2275 bool has_on_target_error, BlockdevOnError on_target_error,
2276 Error **errp)
2277 {
2278 BlockBackend *blk;
2279 BlockDriverState *bs;
2280 BlockDriverState *target_bs;
2281 BlockDriverState *source = NULL;
2282 AioContext *aio_context;
2283 BlockDriver *drv = NULL;
2284 Error *local_err = NULL;
2285 int flags;
2286 int64_t size;
2287 int ret;
2288
2289 if (!has_speed) {
2290 speed = 0;
2291 }
2292 if (!has_on_source_error) {
2293 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2294 }
2295 if (!has_on_target_error) {
2296 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2297 }
2298 if (!has_mode) {
2299 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2300 }
2301
2302 blk = blk_by_name(device);
2303 if (!blk) {
2304 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2305 return;
2306 }
2307 bs = blk_bs(blk);
2308
2309 aio_context = bdrv_get_aio_context(bs);
2310 aio_context_acquire(aio_context);
2311
2312 /* Although backup_run has this check too, we need to use bs->drv below, so
2313 * do an early check redundantly. */
2314 if (!bdrv_is_inserted(bs)) {
2315 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2316 goto out;
2317 }
2318
2319 if (!has_format) {
2320 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2321 }
2322 if (format) {
2323 drv = bdrv_find_format(format);
2324 if (!drv) {
2325 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2326 goto out;
2327 }
2328 }
2329
2330 /* Early check to avoid creating target */
2331 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2332 goto out;
2333 }
2334
2335 flags = bs->open_flags | BDRV_O_RDWR;
2336
2337 /* See if we have a backing HD we can use to create our new image
2338 * on top of. */
2339 if (sync == MIRROR_SYNC_MODE_TOP) {
2340 source = bs->backing_hd;
2341 if (!source) {
2342 sync = MIRROR_SYNC_MODE_FULL;
2343 }
2344 }
2345 if (sync == MIRROR_SYNC_MODE_NONE) {
2346 source = bs;
2347 }
2348
2349 size = bdrv_getlength(bs);
2350 if (size < 0) {
2351 error_setg_errno(errp, -size, "bdrv_getlength failed");
2352 goto out;
2353 }
2354
2355 if (mode != NEW_IMAGE_MODE_EXISTING) {
2356 assert(format && drv);
2357 if (source) {
2358 bdrv_img_create(target, format, source->filename,
2359 source->drv->format_name, NULL,
2360 size, flags, &local_err, false);
2361 } else {
2362 bdrv_img_create(target, format, NULL, NULL, NULL,
2363 size, flags, &local_err, false);
2364 }
2365 }
2366
2367 if (local_err) {
2368 error_propagate(errp, local_err);
2369 goto out;
2370 }
2371
2372 target_bs = NULL;
2373 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2374 if (ret < 0) {
2375 error_propagate(errp, local_err);
2376 goto out;
2377 }
2378
2379 bdrv_set_aio_context(target_bs, aio_context);
2380
2381 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2382 block_job_cb, bs, &local_err);
2383 if (local_err != NULL) {
2384 bdrv_unref(target_bs);
2385 error_propagate(errp, local_err);
2386 goto out;
2387 }
2388
2389 out:
2390 aio_context_release(aio_context);
2391 }
2392
2393 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2394 {
2395 return bdrv_named_nodes_list(errp);
2396 }
2397
2398 void qmp_blockdev_backup(const char *device, const char *target,
2399 enum MirrorSyncMode sync,
2400 bool has_speed, int64_t speed,
2401 bool has_on_source_error,
2402 BlockdevOnError on_source_error,
2403 bool has_on_target_error,
2404 BlockdevOnError on_target_error,
2405 Error **errp)
2406 {
2407 BlockBackend *blk;
2408 BlockDriverState *bs;
2409 BlockDriverState *target_bs;
2410 Error *local_err = NULL;
2411 AioContext *aio_context;
2412
2413 if (!has_speed) {
2414 speed = 0;
2415 }
2416 if (!has_on_source_error) {
2417 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2418 }
2419 if (!has_on_target_error) {
2420 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2421 }
2422
2423 blk = blk_by_name(device);
2424 if (!blk) {
2425 error_setg(errp, "Device '%s' not found", device);
2426 return;
2427 }
2428 bs = blk_bs(blk);
2429
2430 aio_context = bdrv_get_aio_context(bs);
2431 aio_context_acquire(aio_context);
2432
2433 blk = blk_by_name(target);
2434 if (!blk) {
2435 error_setg(errp, "Device '%s' not found", target);
2436 goto out;
2437 }
2438 target_bs = blk_bs(blk);
2439
2440 bdrv_ref(target_bs);
2441 bdrv_set_aio_context(target_bs, aio_context);
2442 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2443 block_job_cb, bs, &local_err);
2444 if (local_err != NULL) {
2445 bdrv_unref(target_bs);
2446 error_propagate(errp, local_err);
2447 }
2448 out:
2449 aio_context_release(aio_context);
2450 }
2451
2452 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2453
2454 void qmp_drive_mirror(const char *device, const char *target,
2455 bool has_format, const char *format,
2456 bool has_node_name, const char *node_name,
2457 bool has_replaces, const char *replaces,
2458 enum MirrorSyncMode sync,
2459 bool has_mode, enum NewImageMode mode,
2460 bool has_speed, int64_t speed,
2461 bool has_granularity, uint32_t granularity,
2462 bool has_buf_size, int64_t buf_size,
2463 bool has_on_source_error, BlockdevOnError on_source_error,
2464 bool has_on_target_error, BlockdevOnError on_target_error,
2465 Error **errp)
2466 {
2467 BlockBackend *blk;
2468 BlockDriverState *bs;
2469 BlockDriverState *source, *target_bs;
2470 AioContext *aio_context;
2471 BlockDriver *drv = NULL;
2472 Error *local_err = NULL;
2473 QDict *options = NULL;
2474 int flags;
2475 int64_t size;
2476 int ret;
2477
2478 if (!has_speed) {
2479 speed = 0;
2480 }
2481 if (!has_on_source_error) {
2482 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2483 }
2484 if (!has_on_target_error) {
2485 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2486 }
2487 if (!has_mode) {
2488 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2489 }
2490 if (!has_granularity) {
2491 granularity = 0;
2492 }
2493 if (!has_buf_size) {
2494 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2495 }
2496
2497 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2498 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2499 "a value in range [512B, 64MB]");
2500 return;
2501 }
2502 if (granularity & (granularity - 1)) {
2503 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
2504 return;
2505 }
2506
2507 blk = blk_by_name(device);
2508 if (!blk) {
2509 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2510 return;
2511 }
2512 bs = blk_bs(blk);
2513
2514 aio_context = bdrv_get_aio_context(bs);
2515 aio_context_acquire(aio_context);
2516
2517 if (!bdrv_is_inserted(bs)) {
2518 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2519 goto out;
2520 }
2521
2522 if (!has_format) {
2523 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2524 }
2525 if (format) {
2526 drv = bdrv_find_format(format);
2527 if (!drv) {
2528 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2529 goto out;
2530 }
2531 }
2532
2533 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2534 goto out;
2535 }
2536
2537 flags = bs->open_flags | BDRV_O_RDWR;
2538 source = bs->backing_hd;
2539 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2540 sync = MIRROR_SYNC_MODE_FULL;
2541 }
2542 if (sync == MIRROR_SYNC_MODE_NONE) {
2543 source = bs;
2544 }
2545
2546 size = bdrv_getlength(bs);
2547 if (size < 0) {
2548 error_setg_errno(errp, -size, "bdrv_getlength failed");
2549 goto out;
2550 }
2551
2552 if (has_replaces) {
2553 BlockDriverState *to_replace_bs;
2554 AioContext *replace_aio_context;
2555 int64_t replace_size;
2556
2557 if (!has_node_name) {
2558 error_setg(errp, "a node-name must be provided when replacing a"
2559 " named node of the graph");
2560 goto out;
2561 }
2562
2563 to_replace_bs = check_to_replace_node(replaces, &local_err);
2564
2565 if (!to_replace_bs) {
2566 error_propagate(errp, local_err);
2567 goto out;
2568 }
2569
2570 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2571 aio_context_acquire(replace_aio_context);
2572 replace_size = bdrv_getlength(to_replace_bs);
2573 aio_context_release(replace_aio_context);
2574
2575 if (size != replace_size) {
2576 error_setg(errp, "cannot replace image with a mirror image of "
2577 "different size");
2578 goto out;
2579 }
2580 }
2581
2582 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2583 && mode != NEW_IMAGE_MODE_EXISTING)
2584 {
2585 /* create new image w/o backing file */
2586 assert(format && drv);
2587 bdrv_img_create(target, format,
2588 NULL, NULL, NULL, size, flags, &local_err, false);
2589 } else {
2590 switch (mode) {
2591 case NEW_IMAGE_MODE_EXISTING:
2592 break;
2593 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2594 /* create new image with backing file */
2595 bdrv_img_create(target, format,
2596 source->filename,
2597 source->drv->format_name,
2598 NULL, size, flags, &local_err, false);
2599 break;
2600 default:
2601 abort();
2602 }
2603 }
2604
2605 if (local_err) {
2606 error_propagate(errp, local_err);
2607 goto out;
2608 }
2609
2610 if (has_node_name) {
2611 options = qdict_new();
2612 qdict_put(options, "node-name", qstring_from_str(node_name));
2613 }
2614
2615 /* Mirroring takes care of copy-on-write using the source's backing
2616 * file.
2617 */
2618 target_bs = NULL;
2619 ret = bdrv_open(&target_bs, target, NULL, options,
2620 flags | BDRV_O_NO_BACKING, drv, &local_err);
2621 if (ret < 0) {
2622 error_propagate(errp, local_err);
2623 goto out;
2624 }
2625
2626 bdrv_set_aio_context(target_bs, aio_context);
2627
2628 /* pass the node name to replace to mirror start since it's loose coupling
2629 * and will allow to check whether the node still exist at mirror completion
2630 */
2631 mirror_start(bs, target_bs,
2632 has_replaces ? replaces : NULL,
2633 speed, granularity, buf_size, sync,
2634 on_source_error, on_target_error,
2635 block_job_cb, bs, &local_err);
2636 if (local_err != NULL) {
2637 bdrv_unref(target_bs);
2638 error_propagate(errp, local_err);
2639 goto out;
2640 }
2641
2642 out:
2643 aio_context_release(aio_context);
2644 }
2645
2646 /* Get the block job for a given device name and acquire its AioContext */
2647 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
2648 Error **errp)
2649 {
2650 BlockBackend *blk;
2651 BlockDriverState *bs;
2652
2653 blk = blk_by_name(device);
2654 if (!blk) {
2655 goto notfound;
2656 }
2657 bs = blk_bs(blk);
2658
2659 *aio_context = bdrv_get_aio_context(bs);
2660 aio_context_acquire(*aio_context);
2661
2662 if (!bs->job) {
2663 aio_context_release(*aio_context);
2664 goto notfound;
2665 }
2666
2667 return bs->job;
2668
2669 notfound:
2670 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
2671 "No active block job on device '%s'", device);
2672 *aio_context = NULL;
2673 return NULL;
2674 }
2675
2676 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2677 {
2678 AioContext *aio_context;
2679 BlockJob *job = find_block_job(device, &aio_context, errp);
2680
2681 if (!job) {
2682 return;
2683 }
2684
2685 block_job_set_speed(job, speed, errp);
2686 aio_context_release(aio_context);
2687 }
2688
2689 void qmp_block_job_cancel(const char *device,
2690 bool has_force, bool force, Error **errp)
2691 {
2692 AioContext *aio_context;
2693 BlockJob *job = find_block_job(device, &aio_context, errp);
2694
2695 if (!job) {
2696 return;
2697 }
2698
2699 if (!has_force) {
2700 force = false;
2701 }
2702
2703 if (job->user_paused && !force) {
2704 error_setg(errp, "The block job for device '%s' is currently paused",
2705 device);
2706 goto out;
2707 }
2708
2709 trace_qmp_block_job_cancel(job);
2710 block_job_cancel(job);
2711 out:
2712 aio_context_release(aio_context);
2713 }
2714
2715 void qmp_block_job_pause(const char *device, Error **errp)
2716 {
2717 AioContext *aio_context;
2718 BlockJob *job = find_block_job(device, &aio_context, errp);
2719
2720 if (!job || job->user_paused) {
2721 return;
2722 }
2723
2724 job->user_paused = true;
2725 trace_qmp_block_job_pause(job);
2726 block_job_pause(job);
2727 aio_context_release(aio_context);
2728 }
2729
2730 void qmp_block_job_resume(const char *device, Error **errp)
2731 {
2732 AioContext *aio_context;
2733 BlockJob *job = find_block_job(device, &aio_context, errp);
2734
2735 if (!job || !job->user_paused) {
2736 return;
2737 }
2738
2739 job->user_paused = false;
2740 trace_qmp_block_job_resume(job);
2741 block_job_resume(job);
2742 aio_context_release(aio_context);
2743 }
2744
2745 void qmp_block_job_complete(const char *device, Error **errp)
2746 {
2747 AioContext *aio_context;
2748 BlockJob *job = find_block_job(device, &aio_context, errp);
2749
2750 if (!job) {
2751 return;
2752 }
2753
2754 trace_qmp_block_job_complete(job);
2755 block_job_complete(job, errp);
2756 aio_context_release(aio_context);
2757 }
2758
2759 void qmp_change_backing_file(const char *device,
2760 const char *image_node_name,
2761 const char *backing_file,
2762 Error **errp)
2763 {
2764 BlockBackend *blk;
2765 BlockDriverState *bs = NULL;
2766 AioContext *aio_context;
2767 BlockDriverState *image_bs = NULL;
2768 Error *local_err = NULL;
2769 bool ro;
2770 int open_flags;
2771 int ret;
2772
2773 blk = blk_by_name(device);
2774 if (!blk) {
2775 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2776 return;
2777 }
2778 bs = blk_bs(blk);
2779
2780 aio_context = bdrv_get_aio_context(bs);
2781 aio_context_acquire(aio_context);
2782
2783 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2784 if (local_err) {
2785 error_propagate(errp, local_err);
2786 goto out;
2787 }
2788
2789 if (!image_bs) {
2790 error_setg(errp, "image file not found");
2791 goto out;
2792 }
2793
2794 if (bdrv_find_base(image_bs) == image_bs) {
2795 error_setg(errp, "not allowing backing file change on an image "
2796 "without a backing file");
2797 goto out;
2798 }
2799
2800 /* even though we are not necessarily operating on bs, we need it to
2801 * determine if block ops are currently prohibited on the chain */
2802 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
2803 goto out;
2804 }
2805
2806 /* final sanity check */
2807 if (!bdrv_chain_contains(bs, image_bs)) {
2808 error_setg(errp, "'%s' and image file are not in the same chain",
2809 device);
2810 goto out;
2811 }
2812
2813 /* if not r/w, reopen to make r/w */
2814 open_flags = image_bs->open_flags;
2815 ro = bdrv_is_read_only(image_bs);
2816
2817 if (ro) {
2818 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
2819 if (local_err) {
2820 error_propagate(errp, local_err);
2821 goto out;
2822 }
2823 }
2824
2825 ret = bdrv_change_backing_file(image_bs, backing_file,
2826 image_bs->drv ? image_bs->drv->format_name : "");
2827
2828 if (ret < 0) {
2829 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
2830 backing_file);
2831 /* don't exit here, so we can try to restore open flags if
2832 * appropriate */
2833 }
2834
2835 if (ro) {
2836 bdrv_reopen(image_bs, open_flags, &local_err);
2837 if (local_err) {
2838 error_propagate(errp, local_err); /* will preserve prior errp */
2839 }
2840 }
2841
2842 out:
2843 aio_context_release(aio_context);
2844 }
2845
2846 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2847 {
2848 QmpOutputVisitor *ov = qmp_output_visitor_new();
2849 BlockBackend *blk;
2850 QObject *obj;
2851 QDict *qdict;
2852 Error *local_err = NULL;
2853
2854 /* Require an ID in the top level */
2855 if (!options->has_id) {
2856 error_setg(errp, "Block device needs an ID");
2857 goto fail;
2858 }
2859
2860 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
2861 * cache.direct=false instead of silently switching to aio=threads, except
2862 * when called from drive_new().
2863 *
2864 * For now, simply forbidding the combination for all drivers will do. */
2865 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2866 bool direct = options->has_cache &&
2867 options->cache->has_direct &&
2868 options->cache->direct;
2869 if (!direct) {
2870 error_setg(errp, "aio=native requires cache.direct=true");
2871 goto fail;
2872 }
2873 }
2874
2875 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2876 &options, NULL, &local_err);
2877 if (local_err) {
2878 error_propagate(errp, local_err);
2879 goto fail;
2880 }
2881
2882 obj = qmp_output_get_qobject(ov);
2883 qdict = qobject_to_qdict(obj);
2884
2885 qdict_flatten(qdict);
2886
2887 blk = blockdev_init(NULL, qdict, &local_err);
2888 if (local_err) {
2889 error_propagate(errp, local_err);
2890 goto fail;
2891 }
2892
2893 if (bdrv_key_required(blk_bs(blk))) {
2894 blk_unref(blk);
2895 error_setg(errp, "blockdev-add doesn't support encrypted devices");
2896 goto fail;
2897 }
2898
2899 fail:
2900 qmp_output_visitor_cleanup(ov);
2901 }
2902
2903 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2904 {
2905 BlockJobInfoList *head = NULL, **p_next = &head;
2906 BlockDriverState *bs;
2907
2908 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
2909 AioContext *aio_context = bdrv_get_aio_context(bs);
2910
2911 aio_context_acquire(aio_context);
2912
2913 if (bs->job) {
2914 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2915 elem->value = block_job_query(bs->job);
2916 *p_next = elem;
2917 p_next = &elem->next;
2918 }
2919
2920 aio_context_release(aio_context);
2921 }
2922
2923 return head;
2924 }
2925
2926 QemuOptsList qemu_common_drive_opts = {
2927 .name = "drive",
2928 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2929 .desc = {
2930 {
2931 .name = "snapshot",
2932 .type = QEMU_OPT_BOOL,
2933 .help = "enable/disable snapshot mode",
2934 },{
2935 .name = "discard",
2936 .type = QEMU_OPT_STRING,
2937 .help = "discard operation (ignore/off, unmap/on)",
2938 },{
2939 .name = "cache.writeback",
2940 .type = QEMU_OPT_BOOL,
2941 .help = "enables writeback mode for any caches",
2942 },{
2943 .name = "cache.direct",
2944 .type = QEMU_OPT_BOOL,
2945 .help = "enables use of O_DIRECT (bypass the host page cache)",
2946 },{
2947 .name = "cache.no-flush",
2948 .type = QEMU_OPT_BOOL,
2949 .help = "ignore any flush requests for the device",
2950 },{
2951 .name = "aio",
2952 .type = QEMU_OPT_STRING,
2953 .help = "host AIO implementation (threads, native)",
2954 },{
2955 .name = "format",
2956 .type = QEMU_OPT_STRING,
2957 .help = "disk format (raw, qcow2, ...)",
2958 },{
2959 .name = "rerror",
2960 .type = QEMU_OPT_STRING,
2961 .help = "read error action",
2962 },{
2963 .name = "werror",
2964 .type = QEMU_OPT_STRING,
2965 .help = "write error action",
2966 },{
2967 .name = "read-only",
2968 .type = QEMU_OPT_BOOL,
2969 .help = "open drive file as read-only",
2970 },{
2971 .name = "throttling.iops-total",
2972 .type = QEMU_OPT_NUMBER,
2973 .help = "limit total I/O operations per second",
2974 },{
2975 .name = "throttling.iops-read",
2976 .type = QEMU_OPT_NUMBER,
2977 .help = "limit read operations per second",
2978 },{
2979 .name = "throttling.iops-write",
2980 .type = QEMU_OPT_NUMBER,
2981 .help = "limit write operations per second",
2982 },{
2983 .name = "throttling.bps-total",
2984 .type = QEMU_OPT_NUMBER,
2985 .help = "limit total bytes per second",
2986 },{
2987 .name = "throttling.bps-read",
2988 .type = QEMU_OPT_NUMBER,
2989 .help = "limit read bytes per second",
2990 },{
2991 .name = "throttling.bps-write",
2992 .type = QEMU_OPT_NUMBER,
2993 .help = "limit write bytes per second",
2994 },{
2995 .name = "throttling.iops-total-max",
2996 .type = QEMU_OPT_NUMBER,
2997 .help = "I/O operations burst",
2998 },{
2999 .name = "throttling.iops-read-max",
3000 .type = QEMU_OPT_NUMBER,
3001 .help = "I/O operations read burst",
3002 },{
3003 .name = "throttling.iops-write-max",
3004 .type = QEMU_OPT_NUMBER,
3005 .help = "I/O operations write burst",
3006 },{
3007 .name = "throttling.bps-total-max",
3008 .type = QEMU_OPT_NUMBER,
3009 .help = "total bytes burst",
3010 },{
3011 .name = "throttling.bps-read-max",
3012 .type = QEMU_OPT_NUMBER,
3013 .help = "total bytes read burst",
3014 },{
3015 .name = "throttling.bps-write-max",
3016 .type = QEMU_OPT_NUMBER,
3017 .help = "total bytes write burst",
3018 },{
3019 .name = "throttling.iops-size",
3020 .type = QEMU_OPT_NUMBER,
3021 .help = "when limiting by iops max size of an I/O in bytes",
3022 },{
3023 .name = "copy-on-read",
3024 .type = QEMU_OPT_BOOL,
3025 .help = "copy read data from backing file into image file",
3026 },{
3027 .name = "detect-zeroes",
3028 .type = QEMU_OPT_STRING,
3029 .help = "try to optimize zero writes (off, on, unmap)",
3030 },
3031 { /* end of list */ }
3032 },
3033 };
3034
3035 QemuOptsList qemu_drive_opts = {
3036 .name = "drive",
3037 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3038 .desc = {
3039 /*
3040 * no elements => accept any params
3041 * validation will happen later
3042 */
3043 { /* end of list */ }
3044 },
3045 };
AR7 emulation for QEMU